Well lens implies an item that provide a focus. I work with optical
engineers all the time and when you imply Lens for a window I assumed
you were a ******.

Dont listen to Mooron. I spent over 2000 bucks on Lexan for my side
windows and after 8 years they are not living up to my expecations of
clarity. If you have a small "lens" then go with Armored glass not
Lexan. Lexan may be as tough but in the long run Glass is superior. How
large is your "lens"?

Joe